KR20120067845A - Coupling apparatus of frames in switchgear enclosure - Google Patents

Abstract

PURPOSE: An apparatus coupling frames for a switchgear container is provided to restrict the insertion depth of a fixing nut. CONSTITUTION: A pair of assistant frame connection projection parts(4b) of a connection plate member is inserted into an assistant frame. The assistant structure has a hollow structure. A second fixing bolt(5) is inserted into a third fixing bolt of a connection plate member. A closed type main frame(1) and an assistant frame are combined with each other in a state that the main frame and connection plate are combined.

Description

Frame coupling device for enclosure of switchgear {COUPLING APPARATUS OF FRAMES IN SWITCHGEAR ENCLOSURE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchgear, and more particularly to a coupling device for an enclosure for a switchgear frame.

A switchgear for power distribution is a power device that safely supplies electric power in a power system to a customer. In the switchgear, an enclosure frame includes a plurality of vertical frames and horizontal frames that determine the width, height, and depth of an enclosure skeleton. A main frame and an auxiliary frame assembled to the main frame to support electrical devices of the switchgear provided inside the enclosure.

In such a switchgear, the main frame and the auxiliary frame of the enclosure frame have a plurality of bolt through holes at predetermined intervals for connection and assembly, respectively, and the connection assembly of the main frame and the auxiliary frame is a bolt hole in the prior art. This was done by means of formed "U" metal connecting plates and bolts and nuts.

The connection and assembly of the main frame and the auxiliary frame according to the related art is not a problem in the case where the main frame and the auxiliary frame are both “U” shaped and having an open surface having an open cross section (Opern Loop type). When the main frame having a cross-sectional shape (closed loop type) is used, the bolt and nut in the main frame cannot be fastened, and thus, the main frame by the "U" shaped metal connecting plate and the bolt and nut according to the prior art. There was a problem in that the connection and assembly of the auxiliary frame is impossible.

Accordingly, the present invention is to solve the problems of the prior art, an object of the present invention is a frame coupling device for an enclosure of a switchgear that can easily connect and assemble a closed main frame and an open or closed auxiliary frame. To provide.

Another object of the present invention is to provide a frame for an enclosure of a switchgear having the frame coupling device for the enclosure.

One object of the present invention is a coupling device for an enclosure frame including a closed main frame and an auxiliary frame, the frame coupling device for an enclosure of a switchgear,

A fixing nut having a base portion rotatable and insertable into an insertion hole portion formed in the closed main frame, an upper portion exposed out of the insertion hole portion, and a first bolt hole portion extending from the upper portion to the base portion and having a threaded surface;

It is installed on the surface of the closed main frame in the position where the fixing nut is installed, and is formed to stand from both sides of the base plate portion having a second bolt hole, and the base plate portion, each having a third bolt hole A connecting plate member having a pair of auxiliary frame connecting protrusions inserted into the auxiliary frame;

A first fixing bolt connected to a second bolt hole of the connecting plate member and a first bolt hole of the fixing nut; And

A second fixing bolt penetrating through the auxiliary frame and inserted into a third fixing bolt hole of the connecting plate member to connect the auxiliary frame to the connecting plate member; It can be achieved by providing a frame coupling device for the enclosure of the switchgear according to the present invention comprising a.

Another object of the present invention, in the frame for the enclosure of the switchgear,

A closed main frame having a plurality of insertion openings;

An auxiliary frame connected to the closed main frame and having a bolt connection;

A fixing nut having a base portion rotatable and insertable into an insertion hole portion formed in the closed main frame, an upper portion exposed out of the insertion hole portion, and a first bolt hole portion extending from the upper portion to the base portion and having a threaded surface;

It is installed on the surface of the closed main frame in the position where the fixing nut is installed, and is formed to stand from both sides of the base plate portion having a second bolt hole, and the base plate portion, each having a third bolt hole A connecting plate member having a pair of auxiliary frame connecting protrusions inserted into the auxiliary frame;

A first fixing bolt connected to a second bolt hole of the connecting plate member and a first bolt hole of the fixing nut; And

A second fixing bolt penetrating through the auxiliary frame and inserted into a third fixing bolt hole of the connecting plate member to connect the auxiliary frame to the connecting plate member; It can be achieved by providing a frame for the enclosure of the switchgear according to the invention comprising a.

The frame coupling device for an enclosure of a switchgear according to the present invention includes: a connecting nut having a fixing nut inserted into an insertion hole formed in a closed main frame, and a pair of auxiliary frame connecting protrusions inserted into an auxiliary frame; A first fixing bolt connected to the second bolt hole of the connecting plate member and the first bolt hole of the fixing nut and an auxiliary frame to be inserted into the third fixing bolt hole of the connecting plate member to connect the auxiliary frame to the connecting plate member. Since two fixing bolts are included, an effect of connecting and coupling the main frame and the auxiliary frame of the closed structure can be obtained.

In the frame coupling device for an enclosure of a switchgear according to the present invention, since the fixing nut has a top portion having a larger area than the insertion hole portion, the effect that the depth of insertion of the fixing nut into the insertion hole portion of the main frame can be limited. Can be.

In the frame coupling device for an enclosure for a switchgear according to the present invention, the insertion port portion of the main frame is formed by a square insertion hole portion, and the fixing nut is formed on the wall surface of the insertion hole portion when it is rotated after insertion into the insertion hole of the closed main frame. Since it further includes a flat part for stopping the rotation of the fixing nut and a support outer circumferential part including a curved part except the flat part, when the fixing nut is inserted into the insertion hole of the main frame and rotated by a predetermined angle, the flat part touches the wall surface of the insertion hole part. By stopping the rotation of the fastening nut, there is an advantage that the fixing and support of the fastening nut in the main frame can be made firm.

The frame for the enclosure of the switchgear according to the present invention includes a closed main frame having a plurality of insertion openings, an auxiliary frame having a bolt connection port, and a base and an insertion opening rotatable into an insertion opening formed in a closed main frame. A connecting plate member having a fixing nut having a first bolt hole having a threaded surface, the uppermost part of which is exposed from the uppermost part and the uppermost part, and a pair of auxiliary frame connecting protrusions inserted into the auxiliary frame; A second fixing bolt inserted through the first fixing bolt connected to the second bolt hole and the first bolt hole of the fixing nut and the auxiliary frame to the third fixing bolt hole of the connecting plate member to connect the auxiliary frame to the connecting plate member. Since it is configured to include, it is possible to obtain the effect of connecting and coupling the main frame and the auxiliary frame of the closed structure.

In the frame for the enclosure of the switchgear according to the present invention, since the fixing nut has a top portion having a larger area than the insertion hole portion, the depth at which the fixing nut is inserted into the insertion hole portion of the main frame can be obtained. .

In the frame for an enclosure of a switchgear according to the present invention, the insertion port portion of the main frame is formed by a square insertion hole portion, and the fixing nut contacts the wall surface of the insertion hole portion when it is rotated after insertion into the insertion hole portion of the closed main frame. Since the fixing nut further includes a flat part for stopping the rotation of the fixing nut and a support outer circumferential surface part including a curved part except the flat part, the fixing nut is inserted into the insertion hole of the main frame and rotated by a predetermined angle to fix the flat part against the wall surface of the insertion hole part. By stopping the rotation of the nut, there is an advantage that the positioning and support of the fixing nut in the main frame can be made firm.

1 is a perspective view showing an example of an enclosure configuration of a switchgear including a frame for an enclosure of a switchgear according to the present invention;
2 is a partially assembled perspective view showing a partially assembled state appearance of the frame for a switchgear according to the present invention;
FIG. 3 is a partial cross-sectional view showing the connection structure of the auxiliary frame and the connecting plate member among the frames for the enclosure of the switchgear according to the preferred embodiment of the present invention.
Figure 4 is a partial longitudinal cross-sectional view showing the termination of the closed main frame to show the connection structure of the fixed nut and the closed main frame of the frame for the switchgear according to an embodiment of the present invention,
5 is an assembled state partial perspective view illustrating an assembled state in which a fixing nut is inserted into a closed main frame of the frame coupling device for an enclosure of a switchgear according to a preferred embodiment of the present invention;
Figure 6 is a front view showing the characteristic configuration of the fixing nut of the frame coupling device for the enclosure of the switchgear according to an embodiment of the present invention,
FIG. 7 is a cross-sectional view of the fixing nut viewed from the top of the fixing nut of FIG. 6 cut along the line A-A 'to show a characteristic configuration of the fixing nut of the frame coupling device for the switchgear according to the preferred embodiment of the present invention.
8 to 13 is after inserting the fixing nut to the closed main frame in the frame for the enclosure of the switchgear according to a preferred embodiment of the present invention and rotated 90 degrees, after installing the connecting plate member on the upper surface of the fixing nut Is an assembly process diagram showing a process of joining the connecting plate member and the closed main frame with fixing bolts.
FIG. 8 is an oblique view from above of a state in which a fixing nut and connecting plate member and a first fixing bolt and nut are prepared to be assembled on an insertion hole of a closed main frame in an enclosure frame of a switchgear according to a preferred embodiment of the present invention. This is a perspective view,
9 is a perspective view illustrating a state in which a fixing nut is inserted into an insertion hole of a main frame in an enclosure for a switchgear according to a preferred embodiment of the present invention;
10 is a perspective view illustrating a state in which a fixing nut is inserted into an insertion hole of a main frame and then rotated 90 degrees in the frame for an enclosure of a switchgear according to an exemplary embodiment of the present invention.
FIG. 11 is a view illustrating a state in which a connecting plate member and a closed main frame are coupled with fixing bolts after installing a connecting plate member on an upper surface of the fixing nut in the frame for the enclosure of the switchgear according to the preferred embodiment of the present invention. Is a perspective view,
12 to 13 are partial cross-sectional views showing a process of stopping the flat part of the outer peripheral surface of the fixing nut by touching the wall surface of the insertion hole after inserting the fixing nut into the insertion hole of the main frame and rotating it by 90 degrees.
12 is a partial cross-sectional view showing a state of an insertion hole and a support outer peripheral portion of the main frame and the fixing nut in a state where the fixing nut is inserted into the insertion opening of the main frame;
FIG. 13 is a partial cross-sectional view showing a state in which the flat part of the support outer peripheral surface portion of the fixing nut stops the rotation of the fixing nut by inserting the fixing nut into the insertion hole of the main frame and rotating it by 90 degrees.
14 is a view showing a state in which the assembly of the frame for the switchgear and the coupling device according to the preferred embodiment of the present invention is completed, the closed main frame is a longitudinal cross-sectional view showing the connection configuration with the fixing nut,
15 is a frame and coupling device for an enclosure of a switchgear according to a preferred embodiment of the present invention, when the first fixing bolt is screwed into the fixing nut through the connecting plate member, the fixing nut is inserted into the insertion hole. Partial enlarged longitudinal cross-sectional view showing constitutive features in which depth can be maintained.

The object of the present invention and the constitution and effect of the present invention to achieve the same will be more clearly understood by the following description of the preferred embodiment of the present invention with reference to the accompanying drawings.

First, a partial perspective view showing an example of an enclosure configuration of a switchgear including a frame for an enclosure of a switchgear according to the present invention will be described with reference to FIG. 1.

The enclosure of the switchgear in FIG. 1 includes a base frame B for supporting components of the upper switchgear at the bottom, and a plurality of vertical and horizontal frames for determining the width, height and depth of the enclosure skeleton. And a main frame 1 formed in a closed shape (that is, closed curve shape), an auxiliary frame 2 connected to the main frame 1 to form an auxiliary support frame, and an auxiliary frame 2 It comprises a door 10 that is rotatably coupled by a hinge to.

The main frame 1 has a plurality of insertion openings 1a which are formed at predetermined intervals apart along the longitudinal direction of at least one surface, as can be seen in FIGS. 5 and 8 to 10. Insertion port portion (1a) is formed as a square insertion port portion in accordance with a preferred embodiment, the insertion hole portion (1a) is formed as a square insertion port portion in accordance with an embodiment of the present invention. The main frame 1 and the auxiliary frame 2 may preferably be composed of steel frames.

The auxiliary frame 2 also has a plurality of bolted connections 2a which are formed at predetermined intervals along the longitudinal direction of at least one surface, as can be seen in FIG. 2 or FIG. 4. The auxiliary frame 2 may be an open type having at least one surface open, or may have a closed type (cross section forming a closed curve) like the main frame 1. The auxiliary frame 2 has a hollow structure having an empty interior, regardless of whether it is open or closed, and has a configuration in which cross-sections at both ends are open in communication with the interior of the hollow.

The configuration, assembly method and operation of the coupling device of the closed main frame 1 and the auxiliary frame 2 according to the present invention in the enclosure of the switchgear configured as described above will be described with reference to FIGS. 2 to 15. As follows.

As shown, the frame coupling device for the enclosure of the switchgear according to the preferred embodiment of the present invention has a fixing nut 3, a connecting plate member 4, a first fixing bolt 6 and a second fixing bolt 5. It is configured to include).

As can be seen in FIG. 5 or FIG. 6, the fixing nut 3 includes bases 3a1 and 3a2 which can be inserted and rotated into an insertion hole 1a formed in the closed main frame 1, and an insertion hole portion. (1a) It has the uppermost part 3c exposed to the outside, and the 1st bolting part 3d extended from the uppermost part 3c to (3a1, 3a2), and the threaded surface formed.

As can be seen from FIGS. 5 to 6, the support outer circumferential surface portion 3b located just below the uppermost portion 3c further included in the fixing nut 3 has a configuration according to the features of the present invention. That is, as shown in FIG. 7, which is a cross-sectional view taken along the line A-A 'of FIG. 6, when inserted into the insertion opening 1a of the main frame 1 and rotated clockwise in the 90 degree view, the insertion opening 1a The support outer peripheral surface part 3b includes the flat part 3b1 which touches the wall surface 1a1 of the ()), and stops rotation of the fixing nut 3, and the curved part 3b2 except the planar part 3b1.

The bases 3a1 and 3a2 are formed of a first base 3a1 which forms the lowermost part of the fixing nut 3 and a second base 3 which is located between the first base 3a1 and the support outer circumferential part 3b in the vertical direction. 3a2).

Here, the first base portion 3a1 has a quadrangular cross-sectional shape in the embodiment, and the cross-sectional area is much smaller than the area of the insertion port portion 1a. The second base portion 3a2 has a quadrangular cross-sectional shape in the embodiment and has a cross sectional area substantially equal to the area of the insertion hole 1a or smaller than the area of the insertion hole 1a by a predetermined tolerance.

As best shown in FIG. 15, the top 3c of the fastening nut 3 has a larger area than the insertion opening 1a so as to limit the depth into which the fastening nut 3 is inserted into the insertion opening 1a. .

Preferably, the fixing nut 3 may be made of synthetic resin or rubber material.

As can be seen from FIGS. 8 to 11, the connecting plate member 4 is installed on the surface of the main frame 1 at the position where the fixing nut 3 is installed. The connecting plate member 4 includes a base plate portion 4a and a pair of auxiliary frame connecting protrusions 4b.

The base plate portion 4a has a second bolt hole portion (see reference numeral 4c in Figs. 8 to 10).

8 to 11, the pair of auxiliary frame connecting protrusions 4b are formed to stand from both sides of the base plate portion 4a and each has a third bolt hole portion 4d. The pair of auxiliary frame connecting protrusions 4b are inserted into the auxiliary frame 2. As described above, the auxiliary frame 2 has a hollow structure in which the inside is empty regardless of whether it is open or closed, and the cross-sections at both ends are open to communicate with the inside of the hollow. The pair of auxiliary frame connecting protrusions 4b may be inserted into the auxiliary frame 2 as shown in FIG. 3 through an open cross section of at least one of both ends of the auxiliary frame 2.

As can be seen from FIGS. 8 to 10, the first fixing bolt 6 is connected to the second bolt hole 4c of the connecting plate member 4 and the first bolt hole 3d of the fixing nut 3. Connected. In other words, the first fixing bolt 6 may extend through the second bolt hole 4c of the connecting plate member 4 and be screwed and connected to the first bolt hole 3d of the fixing nut 3. .

As can be seen in FIG. 3, the second fixing bolt 5 penetrates through the auxiliary frame 2 through the bolt connection opening (see 2a in FIG. 2 or 4), and thus the third of the connecting plate member 4. It fits in the fixing bolt opening part 4d, and connects the auxiliary frame 2 with the connecting plate member 4. As shown in FIG. Here, the second fixing bolt 5 is composed of a pair.

At the same time, the effect of the frame coupling device for the enclosure of the switch gear according to the preferred embodiment of the present invention configured as described above attached to the frame for the enclosure of the switch gear according to the preferred embodiment of the present invention with reference to Figs. When describing the assembling method of the main frame (1) and the auxiliary frame (2) by the coupling device as follows.

First, the main frame 1 and the auxiliary frame 2 and the fixing nut 3 of the frame coupling device for the enclosure according to the present invention, the connecting plate member 4, the first fixing bolt 6, the second fixing bolt (5) and washer (7) are prepared.

Next, as shown in FIG. 8, the fixing nut 3 is inserted into the insertion opening 1a of the corresponding position to which the auxiliary frame 2 of the main frame 1 is to be coupled. At this time, the uppermost portion (see reference numeral 3c of FIGS. 5 and 15) having an area larger than that of the insertion opening portion 1a is exposed to the outside of the insertion opening portion 1a, and the supporting outer peripheral surface portion of the fixing nut 3 (see FIG. 5). The curved surface portion (reference numeral 3b1 in FIG. 12) of reference numeral 3b comes into contact with the wall surface of the insertion port portion 1a.

When the fixing nut 3 is inserted into the insertion hole 1a, the state shown in FIG. 9 is completed.

Next, from the state shown in FIG. 9 to the state shown in FIG. 10, the fixing nut 3 is rotated 90 degrees clockwise or counterclockwise. At this time, as shown in FIG. 12, the support outer circumferential surface portion 3b of the fixing nut 3, in which the curved surface portion 3b2 is in contact with the wall surface 1a1 of the insertion port portion 1a of the main frame 1, is shown in FIG. 13. As shown in the drawing, the planar portion 3b1 comes into contact with the wall surface 1a1 and stops from further rotation.

11, the connecting plate member 4 is provided on the surface of the main frame 1 at the position where the fixing nut 3 is installed. At this time, the second bolt holes 4c of the connecting plate member 4 and the first bolt balls 3d of the fixing nut 3 are aligned so that the first fixing bolts 6 are aligned. The main frame 1 and the connecting plate member 4 are screwed into the second bolt sphere 4c and the first bolt sphere 3d of the fixing nut 3. In this case, the penetration of the first fixing bolt 6 on the second bolt hole 4c of the connecting plate member 4 is preferably performed in order to increase the frictional force between the first fixing bolt 6 and the connecting plate member 4. The allowable washer 7 is interposed.

Next, the coupling operation of the connecting plate member 4 and the auxiliary frame 2 will be described with reference to FIGS. 3 to 4 and 14 to 15.

3 and 14, the pair of auxiliary frame connecting protrusions 4b of the connecting plate member 4 may be opened through open sections of at least one of both ends of the auxiliary frame 2. Insert into the auxiliary frame (2). As described above, the auxiliary frame 2 has a hollow structure having an empty interior regardless of whether it is open or closed, and has a configuration in which cross sections at both ends are open to communicate with the interior of the hollow. It is possible to insert a pair of auxiliary frame connecting projections 4b of the connecting plate member 4 into the auxiliary frame 2 through an open cross section of at least one of both ends of the frame 2.

Next, as shown in FIGS. 4 and 14, the second fixing bolt 5 is passed through the auxiliary frame 2 through the bolt connection hole (see 2a in FIG. 2 or 4) to connect the connecting plate member 4. When inserted into the third fixing bolt sphere (4d), the auxiliary frame 2 and the connecting plate member 4 is connected (coupled). Then, in the state where the main frame 1 and the connecting plate member 4 are already coupled, the closed main frame 1 and the auxiliary frame 2 are firmly engaged.

The frame for the enclosure of the switchgear according to the preferred embodiment of the present invention, as shown, a closed main frame (1) having a plurality of insertion openings; An auxiliary frame (2) connected to the closed main frame (1) and having a bolt connection (2a); Bases 3a1 and 3a2 which can be inserted and rotated into the insertion opening 1a formed in the closed main frame 1, the top 3c exposed to the outside of the insertion opening 1a, and the base 3 from the top 3c. A fixing nut 3 extending from 3a1 and 3a2 and having a first bolt sphere 3d having a threaded surface; It is provided on the surface of the closed main frame 1 in the position where the fixing nut 3 was installed, and both the base plate part 4a which has the 2nd bolt opening part 4c, and the base plate part 4a A connecting plate member (4) which is formed upright from and has a pair of auxiliary frame connecting protrusions (4b) each having a third bolt hole (4d) and inserted into the auxiliary frame (2); A first fixing bolt 6 connected to the second bolt sphere 4c of the connecting plate member 4 and the first bolt sphere 3d of the fixing nut 3; And a second fixing bolt 5 penetrating through the auxiliary frame 2 to the third fixing bolt port portion 4d of the connecting plate member 4 to connect the auxiliary frame 2 to the connecting plate member 4. ; It is configured to include.

More detailed configuration and effects of the enclosure for the switchgear frame according to the preferred embodiment of the present invention can be referred to the above description of the frame coupling device for the enclosure of the switchgear according to the preferred embodiment of the present invention. It will be omitted to avoid.

As described above, the frame coupling device for the enclosure of the switchgear according to the present invention and the frame for the enclosure having the coupling device are fixed nuts 3 inserted into the insertion opening 1a formed in the closed main frame 1. ) And a first fixing member connected to the connecting plate member 4 and the fixing nut 3 having a connecting plate member 4 having a pair of auxiliary frame connecting protrusions 4b inserted into the auxiliary frame 2. A second fixing bolt that penetrates the bolt 6 and the auxiliary frame 2 to the third fixing bolt hole portion 4d of the connecting plate member 4 to connect the auxiliary frame 2 to the connecting plate member 4; 5), the main frame 1 of the closed structure and the part of the open or closed auxiliary frame 2 can be easily connected and coupled.

In the frame coupling device for an enclosure of a switchgear according to the present invention and the frame for an enclosure having the coupling device, the fixing nut 3 has a top portion 3c having a larger area than the insertion opening portion 1a. The effect that (3) is inserted into the insertion opening 1a of the main frame 1 can be limited.

In the frame coupling device for an enclosure of a switchgear according to the present invention and the frame for an enclosure having the coupling device, the insertion port portion 1a of the main frame 1 is formed of a square insertion hole portion, and the fixing nut 3 is And a flat portion 3b1 which touches the wall surface 1a1 of the insertion opening 1a to stop the rotation of the fixing nut 3 when it is inserted into the insertion opening 1a of the closed main frame 1 and rotated. Since the support outer peripheral surface portion 3b including the curved portion 3b2 except the flat portion 3b1 is further included, the fixing nut 3 is inserted into the insertion opening 1a of the main frame 1 and rotated by 90 degrees. When the flat part 3b1 touches the wall surface 1a1 of the insertion port part 1a and stops the rotation of the fixing nut 3, the position fixing and support of the fixing nut 3 in the main frame 1 are made firm. There is an advantage to this.

1: main frame 1a: insertion hole
1a1: Wall surface (insertion opening) 2: Auxiliary frame
2a: bolt connection 3: retaining nut
3a1: first base 3a2: second base
3b: support outer peripheral surface portion 3b1: flat portion
3b2: curved portion 3c: top
3d: first bolt hole portion 4: connecting plate member
4a: base plate 4b: auxiliary frame connecting protrusion 4c: second bolt hole 4d: third bolt hole
5: second fixing bolt 6: first fixing bolt
7: washer 10: door
B: base frame

Claims (3)

A coupling device for an enclosure frame comprising a closed main frame and an auxiliary frame of a switchgear, the frame engagement device for an enclosure of a switchgear,
A fixing nut having a base portion rotatable and insertable into an insertion hole portion formed in the closed main frame, a top portion exposed out of the insertion hole portion, and a first bolt hole portion extending from the top portion to the base portion and having a threaded surface;
It is installed on the surface of the closed main frame in the position where the fixing nut is installed, and is formed to stand from both sides of the base plate portion having a second bolt hole, and the base plate portion, each having a third bolt hole A connecting plate member having a pair of auxiliary frame connecting protrusions inserted into the auxiliary frame;
A first fixing bolt connected to a second bolt hole of the connecting plate member and a first bolt hole of the fixing nut; And
A second fixing bolt penetrating through the auxiliary frame and inserted into a third fixing bolt hole of the connecting plate member to connect the auxiliary frame to the connecting plate member; Frame coupling device for the enclosure of the switchgear comprising a. The method of claim 1,
The fixing nut,
And the uppermost portion has a larger area than the inserting portion so as to limit the depth at which the fixing nut is inserted into the inserting portion. The method of claim 1,
The insertion port portion is formed of a square insertion hole portion,
The fixing nut,
And a support outer circumferential surface portion including a flat portion contacting the wall surface of the insertion hole portion to stop the rotation of the fixing nut and inserting a curved portion other than the flat portion when inserted into the insertion hole of the closed main frame. Frame coupling device for the switchgear enclosure.

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